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Analysis
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max time kernel
147s -
platform
windows10-2004_x64 -
resource
win10v2004-20231222-en -
resource tags
arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system -
submitted
05/01/2024, 11:48
Static task
static1
1 signatures
Behavioral task
behavioral1
Sample
38a2bda239df58b8c23c02fe497c1a52.exe
Resource
win7-20231215-en
windows7-x64
9 signatures
150 seconds
Behavioral task
behavioral2
Sample
38a2bda239df58b8c23c02fe497c1a52.exe
Resource
win10v2004-20231222-en
windows10-2004-x64
7 signatures
150 seconds
General
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Target
38a2bda239df58b8c23c02fe497c1a52.exe
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Size
162KB
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MD5
38a2bda239df58b8c23c02fe497c1a52
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SHA1
5f5ca91ae11e25ea59f4e22382a963b59e2c0df6
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SHA256
ba77a2d623a46ce9f701d89c2aecec6e1d97c823677cd88c773ec4df93309237
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SHA512
9c7a5eaf79a73b8b42494c8ebc64cb56b20d48ef499a6787b2632d2155b4dfb8a2629ed984410dad9a2d0f104d5fbd09a4ca14ec946cc7c9e90489281391791e
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SSDEEP
3072:prtxEBNrndMAswfvaa0jliOuwnbVFwbGBzK07yL3O/+6sDX:prtxEBNrnGa0iOuEbVFacu07yL3Oa
Score
8/10
Malware Config
Signatures
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Sets DLL path for service in the registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\FastUserSwitchingCompatibility\Parameters\ServiceDll = "C:\\Windows\\FastUserSwitchingCompatibilitybeas.dat" 38a2bda239df58b8c23c02fe497c1a52.exe -
Loads dropped DLL 2 IoCs
pid Process 4820 svchost.exe 1980 rundll32.exe -
Drops file in Windows directory 2 IoCs
description ioc Process File created C:\Windows\FastUserSwitchingCompatibilitybeas.dat 38a2bda239df58b8c23c02fe497c1a52.exe File opened for modification C:\Windows\RCX5294.tmp 38a2bda239df58b8c23c02fe497c1a52.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe 1980 rundll32.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 4820 svchost.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
pid Process 116 38a2bda239df58b8c23c02fe497c1a52.exe 116 38a2bda239df58b8c23c02fe497c1a52.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 116 wrote to memory of 3004 116 38a2bda239df58b8c23c02fe497c1a52.exe 33 PID 116 wrote to memory of 3004 116 38a2bda239df58b8c23c02fe497c1a52.exe 33 PID 116 wrote to memory of 3004 116 38a2bda239df58b8c23c02fe497c1a52.exe 33 PID 4820 wrote to memory of 1980 4820 svchost.exe 32 PID 4820 wrote to memory of 1980 4820 svchost.exe 32 PID 4820 wrote to memory of 1980 4820 svchost.exe 32
Processes
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C:\Users\Admin\AppData\Local\Temp\38a2bda239df58b8c23c02fe497c1a52.exe"C:\Users\Admin\AppData\Local\Temp\38a2bda239df58b8c23c02fe497c1a52.exe"1⤵
- Sets DLL path for service in the registry
- Drops file in Windows directory
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:116 -
C:\Windows\SysWOW64\cmd.execmd /c del "C:\Users\Admin\AppData\Local\Temp\38a2bda239df58b8c23c02fe497c1a52.exe"2⤵PID:3004
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C:\Windows\SysWOW64\svchost.exeC:\Windows\SysWOW64\svchost.exe -k netsvcs -s FastUserSwitchingCompatibility1⤵
- Loads dropped DLL
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4820 -
C:\Windows\SysWOW64\rundll32.exerundll32.exe c:\windows\fastuserswitchingcompatibilitybeas.dat, zzzzz2⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
PID:1980
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